Roger Powell / Common guillemot (Uria aalge) pair at nest, one about to incubate an egg while the other watches, Great Saltee Island, Wexford, Republic of Ireland, June

Roger Powell / Common guillemot (Uria aalge) pair at nest, one about to incubate an egg while the other watches, Great Saltee island, Wexford, Republic of Ireland, June

Erlend Haarberg / Common guillemot (Uria aalge) head portrait, Iceland, July

Erlend Haarberg / Common guillemot (Uria aalge) with a Kittiwake (Rissa tridactyla) behind, Iceland, June

Robert Thompson / A colony of Common Guillemots (Uria aalge) on rugged, guano-covered rocks. Great Saltee Island, of Kilmore Quay, County Wexford, Republic of Ireland, June.

Robert Thompson / Guilletmot (Uria allge) colony on coastal rocks with a gull flying overhead. Great Saltee Island, Kilmore Quay, County Wexford, Republic of Ireland, June.

Guy Edwardes / Razorbill (Alca torda) head portrait, Great Saltee, Coounty Wexford, Republic of Ireland, June

Guy Edwardes / Razorbill (Alca torda) pair preening each other, Great Saltee, Saltee Islands, Co. Wexford, Republic of Ireland, June

Jose Schell / Razorbill chick {Alca torda} out of nest, Canada, Sequence 5/11

Martin Camm / Carwardine / Illustration of Great Auk (Pinguinus impennis). Became extinct in mid 19th century (Wildlife Art Company).